摘要
为提高P92钢的高温抗氧化性,采用电镀镍+低温粉末包埋渗铝技术,在其表面制备Ni-Al双层复合涂层,研究其在650℃下空气中的氧化行为及机理,并与P92钢基体的氧化行为做对比分析。用X射线衍射仪及配有能谱仪探头的扫描电子显微镜分析涂层氧化前后的显微组织、物相组成及元素沿截面的扩散规律。结果表明:复合涂层的渗铝层致密无孔洞,物相组成物为Ni-Al金属间化合物,且由Ni2Al3到β-NiAl的物相转变受Ni/Al互扩散控制;经132 h氧化后,P92钢表面生成双氧化层,外层主要为疏松多孔的Fe2O3,内层为(Fe0.6Cr0.4)2O3,而Ni-Al复合涂层表面则形成保护性的Al2O3,在氧化过程中无明显裂纹,具有良好的结构稳定性。包覆Ni-Al涂层处理后,P92钢单位面积氧化增质量由11 g/m^2降低到2.713 g/m2,明显提高P92钢的抗氧化性。
In order to improve the high temperature oxidation resistance of P92 steel,Ni-Al double-layer composite coating was prepared on the surface of P92 steel by nickel electroplating and low temperature embedded aluminizing,and its oxidation resistance and oxidation mechanism at 650℃were studied in detail.The same anti-oxidation experiment of P92 steel substrate was carried out to make a comparison.X-ray diffraction(XRD)and scanning electron microscopy(SEM)equipped with an energy dispersive spectroscopy(EDS)probe were used to analyze the microscopic morphology,phase composition and diffusion of the elements along the cross-section of coatings before and after oxidation.The results show that the prepared coating is dense and non-porous,the phase composition is Ni-Al intermetallic compound,and the phase transition from Ni2 Al3 toβ-NiAl is controlled by Ni/Al interdiffusion.After oxidation for 132 h,a double oxide layer is formed on the surface of P92 steel.The outer layer is mainly loose and porous Fe2 O3,the inner layer is(Fe0.6 Cr0.4)2 O3.In contrast,the surface of Ni-Al composite coating forms protective Al2 O3 film,there is no obvious crack in the oxidation process.After coated with Ni-Al coating,the oxidation weight gain of P92 steel is reduced from 11 g/m2 to 2.713 g/m2,which indicates that it can significantly improve the oxidation resistance of P92 steel.
作者
田志华
赵勇桃
姜亚君
张桐
鲁海涛
TIAN Zhihua;ZHAO Yongtao;JIANG Yajun;ZHANG Tong;LU Haitao(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2019年第6期24-28,共5页
Ordnance Material Science and Engineering
基金
内蒙古自治区自然科学基金（2017MS(LH)0518）
内蒙古科技大学大学生科技创新基金（2017033）
关键词
电镀
包埋渗
复合涂层
P92钢
高温抗氧化性
扩散
plating
embedding
composite coatings
P92 steel
high temperature oxidation resistance
diffusion
